Abstract
Resonance-enhanced third-harmonic generation (THG) of CO 2 laser radiation has been studied in CO and NO. It is shown that the coherence length for THG in CO can be increased by adding SF 6 and that phase matching occurs for a CO:SF 6 ratio of 208:1. The pressure dependence of the third-harmonic conversion efficiency in CO-SF 6 mixtures has been measured up to 11 atm, and the results are in good agreement with calculated values for the coherence length and the third-order susceptibility tensor.
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